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Washing machine comprising a water purification system

Active Publication Date: 2020-07-02
CONOPCO INC D B A UNILEVER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a washing machine that uses less flocculant, a chemical that helps remove detergent and suspended soil, by controlling the amount of flocculant added. This allows for efficient purification without compromising the effectiveness of the treatment. The machine produces rinsing water from the purified wash liquor, which helps to reduce the amount of flocculant required. The inventors found that the amount of flocculant needed to purify a certain quantity of wash liquor decreases exponentially with each purification cycle. This means that the amount of flocculant used in the next cycle can be lowered as the detergent concentration in the wash liquor decreases. However, a minimum dosage of flocculant needs to be maintained to ensure inadequate purification does not occur.

Problems solved by technology

However, the inventors have found that the flocculant dosage employed during the purification cycles should not drop below a certain minimum dosage as otherwise inadequate purification is observed.

Method used

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  • Washing machine comprising a water purification system

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0106]The performance of a laundry washing machine according to the invention was tested as follows. The washing machine was filled with 8.5 L wash liquor. The wash liquor contained 1 g / I detergent (containing 14.4 wt. % anionic surfactant) and 0.1 g / I model soil.

[0107]During each purification cycle 5 L of wash liquor was treated in the purification system of the washing machine with a flocculant having the composition described in Table 1.

TABLE 1Wt. %Aluminium chlorohydrate52Feldspar43Anionically modified polyacrylamide5

[0108]The residence time of the wash liquor in the flocculation chamber was 60 seconds (30 seconds stirring, 15 seconds pause; 15 seconds stirring).

[0109]The programmed control unit prompted the apparatus to carry out 7 purification cycles during which flocculant was introduced in the flocculation chamber by the flocculant dispensing unit in the dosages shown in Table 2. These dosages were calculated using the following parameter values in the equation Fi=[(1−(v / V))...

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Abstract

The invention relates to a program-controlled apparatus (1) for washing items that is equipped with a water purification system (8) for purifying the wash liquor by removing detergent and suspended soil, which purification system (8) utilizes addition of flocculant, wherein the amount of flocculant that is added is controlled to minimize the total amount of flocculant used without compromising the efficacy of the purification treatment.

Description

FIELD OF THE INVENTION[0001]The present invention relates a program-controlled apparatus for washing items with water containing added detergent, wherein the apparatus has a water purification treatment function that purifies the water containing added detergent by means of flocculation. The invention further relates to a method of washing items in a program-controlled apparatus as described herein before.BACKGROUND OF THE INVENTION[0002]In several geographies water shortage is becoming a more and more acute problem and this is particularly true in developing countries.[0003]Household cleaning processes like laundry, dishes etc., require large amounts of water. The waste water generated in-home from washing and rinsing laundry is generally referred to as greywater. It would be a great benefit if it were possible to reduce the amount of greywater that is produced by households. One possible way of achieving this is to treat the greywater so it can be reused, notably in cleaning proce...

Claims

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Application Information

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IPC IPC(8): D06F39/08D06F33/62D06F34/22C02F1/52B01D21/01B01D21/28B01D21/30
CPCC02F2209/001B01D21/30C02F2307/12D06F39/083C02F1/5281D06F2103/18B01D21/01B01D21/28D06F2105/34D06F34/22D06F2103/22D06F2105/06D06F33/62C02F1/5245C02F2103/002C02F1/5209A47L15/4291D06F39/20D06F39/006
Inventor BISWAS, SARMISTHACHATTERJEE, DEBOSREETHIRUMENI, DHANALAKSHMI
Owner CONOPCO INC D B A UNILEVER
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